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Mean punishers as a function of dose of ethanol. Each participant is represented by a different symbol. Each datum is the mean number of punishers under a drug dose divided by those under the placebo. The dotted horizontal line represents no change from placebo. Top panel: conc VI 12-s VI 60-s; middle panel: conc VI 20-s VI 20-s, bottom panel: conc VI 60-s VI 12-s.
